How many belief systems advocate an endless self sacrificial love?

I’m talking about a love that is practical and leads people to suffer wrongdoing for the sake of others and to sacrifice their own good for that of others. It has to be applied equally to all people not just family, country, etc… and It has to be unconditional meaning it will be extended to a person no matter what that person does (ie. hurting the believer, denying them or their belief, etc..). How many religions/belief systems teach this kind of love?